Used Yamaha Outboard Motors for Sale Used Yamaha outboard for sale with worldwide shipping services. Shop the finest collection of used Yamaha outboard motors & engines for your boat. Yamalube ® 4M / (See owner’s manual) Recommended Fuel Filtration: Yamaha 10-Micron Fuel / Water Separating Filter (external) Add to wishlist. Read more. Yamaha 8HP Outboard Motor Yamaha 9.9-8 HP Portable Outboard Motors | Yamaha Outboards This portable series four-stroke Yamaha outboard ranges in horsepower: 9 and 8HP. (See owner's manual) Recommended Fuel Filtration: Yamaha 10-Micron Fuel/Water Separating Filter (external) C.A.R.B. Rating: 3-Star: 8hp at 5500 rpm: Full Throttle RPM Range: 5000 ~ 6000: Alternator Output at W.O.T. 6 Amp: